EHC SLIMJIM Installation & Technical Manual page 16

6 Amp
L
240V
N
SUPPLY
E
3A Switched
Fuse Isolator

!
This S plan wiring schematic will provide a volt free contact across the boilers RP Connections.
No voltage has been taken to the Grey cable of the zone valves therefore creating a volt free contact
across the grey & orange switch wires of the valves when heating or hot water is in demand.
If the boiler is connected to an existing heating control system with 240 Volt switching then the boilers
control board should be setup as mentioned on page 14 (240 Volt control signals).
6 Amp
L
240V
N
SUPPLY
E

!
The Boilers Control PCB will be damaged if a voltage it put to the RP connections!
GB-063C_f.615
C ONT ROL WI RI NG
Heating & Hot Water Wiring: S Plan (Volt Free Output)
Used for Indirect Plumbing Systems
PROGRAMMER
N L 1 2 3
1 2 3
Heating Only Wiring (Volt Free Output)
Used for Direct Plumbing Systems
PROGRAMMER
N L 1 2
1 2
3A Switched
Fuse Isolator
CYL STAT
4 1 2 3
4 5 6 7 8
BL BR GR OR
HW zone valve
Volt Free Boiler
Connections
ROOM STAT
3 4 1
3 4 5 6 7
16
ROOM STAT
1 2 3
Junction
9 10
box
BL BR GR OR
CH zone valve
R P
Control
2 3
Junction
8 9 10
box
R P
Volt Free Boiler
Control
Connections
Figure 1
Figure 2